I will ask one thing here though:
captainjack23 said:
TL9
J1 is developed but only star to star jumps are possible.
Vilaii expand down their main.
Terrans may or may not use insystem jumping, but are still limited to sol system*.
TL10
The overall limit is still J1*, but now, empty jumps become possible , if difficult and or dangerous, using J1 drives.
Vilanii pass through the empty hexes to scout and establish new risk-free j1 lines and find various other races. Civilian shipping may only seldom cross these points.
Terrans jump to Barnard*, via an empty jump but need a logistic point.
Terrans encounter vilanii and immediately adopt more efficient vilani jump designs; fuel problem diminished.
Vilanii may also use logistic bases to cross similar situations.
So are you suggesting in your solution that the Terrans went from TL9 to TL10 in the space of about... 6-7 years? Because that's how long it took from them to go from discovering J1 to jumping to Barnard via the brown dwarf in IW. If you're having them jump to empty space instead, then that's a one TL leap from 9 to 10 in only 6-7 years (assuming they figured it out in 2095). And then they reached the next TL (11, where they hit J2) in 2124 (29 years later) and then reached TL 12 (J3) 114 years later around 2238 AD? (which seems a bit odd, given that they're at war and you'd think that would tend to advance technology quicker. But I guess J3 is exponentially harder to crack than J2)
Still 6-7 years for a TL 9-10 jump seems a bit quick. That said, they had to go from 9 to 11 in 35 years or so anyway...